// --c++--
#include "gizmos.h"
#include <osgDB/ReadFile>
#include <osgUtil/Optimizer>
#include <osgViewer/Viewer>
#include <osg/CoordinateSystemNode>
#include <osgText/Text>

#include <osgManipulator/CommandManager>
#include <osgManipulator/TabBoxDragger>
#include <osgManipulator/TabPlaneDragger>
#include <osgManipulator/TabPlaneTrackballDragger>
#include <osgManipulator/TrackballDragger>
#include <osgManipulator/Translate1DDragger>
#include <osgManipulator/Translate2DDragger>
#include <osgManipulator/TranslateAxisDragger>

#include <iostream>

//--------------------------------------------------------------
osgManipulator::Dragger* createDragger(const std::string& name)
//--------------------------------------------------------------
{
    osgManipulator::Dragger* dragger = 0;
    if ("TabPlaneDragger" == name)
    {
        osgManipulator::TabPlaneDragger* d = new osgManipulator::TabPlaneDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
    else if ("TabPlaneTrackballDragger" == name)
    {
        osgManipulator::TabPlaneTrackballDragger* d = new osgManipulator::TabPlaneTrackballDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
    else if ("TrackballDragger" == name)
    {
        osgManipulator::TrackballDragger* d = new osgManipulator::TrackballDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
    else if ("Translate1DDragger" == name)
    {
        osgManipulator::Translate1DDragger* d = new osgManipulator::Translate1DDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
    else if ("Translate2DDragger" == name)
    {
        osgManipulator::Translate2DDragger* d = new osgManipulator::Translate2DDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
    else if ("TranslateAxisDragger" == name)
    {
        osgManipulator::TranslateAxisDragger* d = new osgManipulator::TranslateAxisDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
    else
    {
        osgManipulator::TabBoxDragger* d = new osgManipulator::TabBoxDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
 
    return dragger;
}
//--------------------------------------------------------------
osgManipulator::Dragger* createDragger(int i)
//--------------------------------------------------------------
{
  osgManipulator::Dragger* dragger = 0;
  switch(i)
  {
  case 1:
    {
        osgManipulator::TranslateAxisDragger* d = new osgManipulator::TranslateAxisDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
  break;
  case 2:
    {
        osgManipulator::TrackballDragger* d = new osgManipulator::TrackballDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
  break;
  case 3:
    {
        osgManipulator::TabBoxDragger* d = new osgManipulator::TabBoxDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
  break;
  case 4:
    {
        osgManipulator::TabPlaneDragger* d = new osgManipulator::TabPlaneDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
  break;
  case 5:
    {
        osgManipulator::Translate1DDragger* d = new osgManipulator::Translate1DDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
  break;
  case 6:
    {
        osgManipulator::Translate2DDragger* d = new osgManipulator::Translate2DDragger();
        d->setupDefaultGeometry();
        dragger = d;
    }
  break;
  }
  return dragger;
}
//--------------------------------------------------------------
osg::Node* createHUD()
//--------------------------------------------------------------
{
    osg::Geode* geode = new osg::Geode();
    
    std::string timesFont("fonts/arial.ttf");

    osg::StateSet* stateset = geode->getOrCreateStateSet();
    stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);

    osgText::Text* text = new  osgText::Text;
    geode->addDrawable( text );

    osg::Vec3 position(50.0f,50.0f,0.0f);
    text->setPosition(position);
    text->setText("Use the Tab key to switch between the trackball and pick modes.");
    text->setFont(timesFont);

    osg::Camera* camera = new osg::Camera;

    // set the projection matrix
    camera->setProjectionMatrix(osg::Matrix::ortho2D(0,1280,0,1024));

    // set the view matrix    
    camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
    camera->setViewMatrix(osg::Matrix::identity());

    // only clear the depth buffer
    camera->setClearMask(GL_DEPTH_BUFFER_BIT);

    // draw subgraph after main camera view.
    camera->setRenderOrder(osg::Camera::POST_RENDER);

    camera->addChild(geode);
    
    return camera;
}
//--------------------------------------------------------------
osg::Node* addDraggerToScene(osg::Node* scene, osgManipulator::CommandManager* cmdMgr, const std::string& name)
//--------------------------------------------------------------
{
    scene->getOrCreateStateSet()->setMode(GL_NORMALIZE, osg::StateAttribute::ON);

    osgManipulator::Selection* selection = new osgManipulator::Selection;
    selection->addChild(scene);

    osgManipulator::Dragger* dragger = createDragger(name);

    osg::Group* root = new osg::Group;
    root->addChild(dragger);
    root->addChild(selection);
    root->addChild(createHUD());

    float scale = scene->getBound().radius() * 1.6;
    dragger->setMatrix(osg::Matrix::scale(scale, scale, scale) *
                       osg::Matrix::translate(scene->getBound().center()));
    cmdMgr->connect(*dragger, *selection);

    return root;
}
//--------------------------------------------------------------
int foo( int argc, char **argv )
//--------------------------------------------------------------
{

    // use an ArgumentParser object to manage the program arguments.
    osg::ArgumentParser arguments(&argc,argv);
    
    // set up the usage document, in case we need to print out how to use this program.
    arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the standard OpenSceneGraph example which loads and visualises 3d models.");
    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
    arguments.getApplicationUsage()->addCommandLineOption("--image <filename>","Load an image and render it on a quad");
    arguments.getApplicationUsage()->addCommandLineOption("--dem <filename>","Load an image/DEM and render it on a HeightField");
    arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display command line parameters");
    arguments.getApplicationUsage()->addCommandLineOption("--help-env","Display environmental variables available");
    arguments.getApplicationUsage()->addCommandLineOption("--help-keys","Display keyboard & mouse bindings available");
    arguments.getApplicationUsage()->addCommandLineOption("--help-all","Display all command line, env vars and keyboard & mouse bindings.");

    arguments.getApplicationUsage()->addCommandLineOption("--dragger <draggername>","Use the specified dragger for manipulation");
    

    // construct the viewer.
    osgViewer::Viewer viewer;

    // get details on keyboard and mouse bindings used by the viewer.
    viewer.getUsage(*arguments.getApplicationUsage());

    // if user request help write it out to cout.
    bool helpAll = arguments.read("--help-all");
    unsigned int helpType = ((helpAll || arguments.read("-h") || arguments.read("--help"))? osg::ApplicationUsage::COMMAND_LINE_OPTION : 0 ) |
                            ((helpAll ||  arguments.read("--help-env"))? osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE : 0 ) |
                            ((helpAll ||  arguments.read("--help-keys"))? osg::ApplicationUsage::KEYBOARD_MOUSE_BINDING : 0 );
    if (helpType)
    {
        arguments.getApplicationUsage()->write(std::cout, helpType);
        return 1;
    }

    // report any errors if they have occurred when parsing the program arguments.
    if (arguments.errors())
    {
        arguments.writeErrorMessages(std::cout);
        return 1;
    }
    
    if (arguments.argc()<=1)
    {
        arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
        return 1;
    }

    std::string dragger_name = "TabBoxDragger";
    arguments.read("--dragger", dragger_name);

    osg::Timer_t start_tick = osg::Timer::instance()->tick();

    // read the scene from the list of file specified command line args.
    osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);

    // if no model has been successfully loaded report failure.
    if (!loadedModel) 
    {
        std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
        return 1;
    }

    // any option left unread are converted into errors to write out later.
    arguments.reportRemainingOptionsAsUnrecognized();

    // report any errors if they have occurred when parsing the program arguments.
    if (arguments.errors())
    {
        arguments.writeErrorMessages(std::cout);
    }

    osg::Timer_t end_tick = osg::Timer::instance()->tick();

    std::cout << "Time to load = "<<osg::Timer::instance()->delta_s(start_tick,end_tick)<<std::endl;


    // optimize the scene graph, remove redundant nodes and state etc.
    osgUtil::Optimizer optimizer;
    optimizer.optimize(loadedModel.get());

    osg::ref_ptr<osgManipulator::CommandManager> cmdMgr = new osgManipulator::CommandManager;
    
    // pass the loaded scene graph to the viewer.
    viewer.setSceneData(addDraggerToScene(loadedModel.get(), cmdMgr.get(), dragger_name));

    viewer.addEventHandler(new PickModeHandler());

    return viewer.run();
}

